Current probe with replaceable needle tip and quick locking structure

Abstract

The invention relates to the technical field of current probes, and discloses a current probe with a replaceable tip and a quick locking structure, comprising a probe rod sleeve; the needle point rod is in sliding connection with the interior of the needle rod sleeve through a conical block arranged on the circumferential outer surface of the needle point rod in a sleeving mode, and a mounting assembly used for being connected with the needle rod sleeve is arranged on the outer surface of the needle point rod. The current probe with the replaceable needle tip and the rapid locking structure can effectively solve the problems that in the prior art, the needle tip of a current probe is usually fixed to a probe body and cannot be detached, once the integrated needle tip is abraded or damaged, the whole current probe needs to be replaced, resources are wasted, meanwhile, the use cost is increased, and the service life of the current probe is prolonged. In some large-scale electronic manufacturing production lines, frequent current test operation enables the wearing speed of the tip of the probe to be accelerated, and a large number of current probes which are abandoned due to the wearing of the tip are accumulated, so that the production cost is high.

Description

Technical Field

[0001] The invention relates to the technical field of current probes, and in particular to a current probe with a replaceable needle tip and a quick locking structure. Background Art

[0002] A current probe is an electronic test instrument used to measure the current intensity in a circuit without interrupting the continuity of the circuit. It is widely used in electronic circuits, power systems, communication systems, industrial control, laboratory research, electronic equipment testing and other fields. It can be used to monitor current size and waveform, perform fault diagnosis, and perform electromagnetic compatibility testing.

[0003] The existing current probe tip is usually fixed to the probe body and cannot be separated. Once the integrated tip is worn or damaged, the entire current probe often needs to be replaced, which wastes resources and increases the cost of use. In some large-scale electronic manufacturing production lines, frequent current testing operations accelerate the wear of the probe tip, and a large number of current probes discarded due to tip wear are accumulated, resulting in high production costs. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a current probe with a replaceable needle tip and a quick locking structure, which can effectively solve the problem that the current probe needle tip is usually fixed to the probe body and cannot be separated in the prior art. Once the integrated needle tip is worn or damaged, the entire current probe often needs to be replaced, which wastes resources and increases the cost of use. In some large-scale electronic manufacturing production lines, frequent current testing operations accelerate the wear of the probe needle tip, and a large number of current probes discarded due to needle tip wear are accumulated, resulting in high production costs.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a current probe with a replaceable needle tip and a quick locking structure, comprising: Needle bar sleeve; A needle tip rod, the needle tip rod is slidably connected to the inside of the needle rod sleeve through a conical block sleeved on the outer surface of the circumference of the needle tip rod, and the outer surface of the needle tip rod is provided with a mounting assembly that can be used to connect to the needle rod sleeve; Wherein, the mounting assembly comprises a connecting rod, the connecting rod is rotatably connected to the circumferential outer surface of the needle tip rod through a shaft rod arranged inside the connecting rod, and the circumferential outer surface of the shaft rod is sleeved with a torsion spring connected to the inside of the connecting rod, and the circumferential inner surface of the needle rod sleeve is fixedly connected with a ratchet block; Wherein, a guide piece for installing the needle tip rod is arranged at the bottom end of the needle bar sleeve, and a disassembly piece for separating the needle tip rod is arranged inside the needle bar sleeve.

[0006] Furthermore, the guide member includes a magnetic block, the upper surface of which is fixedly connected to the bottom end of the needle rod sleeve, the upper surface of the connecting rod adopts a magnetic design that is magnetically connected to the magnetic block, and four connecting rods are arranged and distributed in a circular array around the central axis of the needle tip rod.

[0007] Furthermore, a vertical groove is provided inside the needle bar sleeve, and the bottom of the vertical groove adopts a trumpet-shaped design. The vertical groove and the magnetic block are staggered with the central axis of the needle tip rod, and the angle between the magnetic block and the vertical groove is forty-five degrees. The circular outer surface of the needle tip rod is fixedly connected with a limit block that fits with the inner wall of the vertical groove. An annular groove is provided inside the needle bar sleeve, and the annular groove is connected to the interior of the vertical groove.

[0008] Furthermore, the needle rod sleeve is connected to a power connection piece via a spring arranged at the top end of the inner wall thereof, and the lower surface of the power connection piece fits with the top end of the needle tip rod.

[0009] Furthermore, the disassembly part includes a baffle, a displacement groove connected to the inside of the annular groove is opened inside the needle rod sleeve, the outer surface of the baffle slides in contact with the inner wall of the displacement groove, and a tension spring connected to the outer surface of the baffle is arranged inside the displacement groove.

[0010] Furthermore, a receiving cavity for placing a connecting rod is provided on the circumferential outer surface of the needle tip rod, a limiting groove communicating with the interior of the receiving cavity is provided inside the needle tip rod, and a limiting plate is slidably connected inside the limiting groove.

[0011] Furthermore, a curved surface block is fixedly connected to the circumferential inner surface of the needle bar sleeve, and four curved surface blocks are arranged around the central axis of the needle bar sleeve, and a contact head is fixedly connected to the bottom end of the needle tip rod.

[0012] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with a needle bar sleeve and a needle tip rod, which are of split design. When the contact head is worn or other types of contact heads are needed, the needle tip rod only needs to be separated from the needle bar sleeve and replaced. This design allows only the needle tip rod to be replaced instead of the entire probe, which can save costs. In the process of installing the needle tip rod, the upper end of the needle tip rod can be accurately fitted with the lower surface of the needle bar sleeve through the mutual attraction between the magnetic block and the connecting rod. Since the magnetic block corresponds to the connecting rod one by one, the initial alignment of the central axis can be completed while the two end surfaces of the needle bar sleeve and the needle tip rod are attracted. During installation, the connecting rod is expanded outward under the action of the torsion spring, and the ratchet block fixedly connected inside the needle bar sleeve makes it very easy to install the needle tip rod into the needle bar sleeve. However, after the connecting rod completely passes through the ratchet block, the needle tip rod can no longer be separated from the needle bar sleeve, and the two need to be separated by subsequent pressing, rotation and flipping. The user can quickly replace the needle tip rod with different characteristics to adapt to various complex test scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a needle rod sleeve and a needle tip rod according to an embodiment of the present invention; Figure 3 Schematic diagram of the cross-sectional structure of a needle bar sleeve according to an embodiment of the present invention; Figure 4 An exploded view of a needle rod sleeve and a needle tip rod according to an embodiment of the present invention; Figure 5 Schematic diagram of the cross-sectional structure of the needle tip rod according to an embodiment of the present invention; Figure 6 is a perspective view of a needle bar sleeve according to an embodiment of the present invention; Figure 7 Another cross-sectional view of the needle bar sleeve of the embodiment of the present invention; Figure 8 For the embodiment of the present invention Figure 7 A schematic diagram of the structure with a partial enlargement at the center; Fig. 9 It is a schematic cross-sectional structure diagram of a connecting rod, a power connection sheet and a conical block according to an embodiment of the present invention; Fig.10 For the embodiment of the present invention Fig. 9A schematic diagram of the structure with a partial enlargement at B in the middle; Fig.11 This is a schematic structural diagram of a needle tip rod, a guide member and a curved surface block according to an embodiment of the present invention; Fig.12 It is a schematic diagram of the cross-sectional structure of the curved surface block according to an embodiment of the present invention.

[0015] The numbers in the figure represent: 1. needle bar sleeve; 11. guide member; 111. magnetic block; 112. vertical groove; 113. limit block; 114. annular groove; 12. disassembly member; 121. baffle; 122. shift groove; 123. tension spring; 13. spring; 14. power connection plate; 15. arc block; 2. needle tip rod; 21. conical block; 22. installation assembly; 221. connecting rod; 222. torsion spring; 223. ratchet block; 23. limit groove; 24. limit plate; 25. contact head. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention will be further described below in conjunction with the embodiments. Example

[0018] See also Figure 1-Figure 12 The present invention provides a technical solution: a current probe with a replaceable needle tip and a quick locking structure, comprising: Needle bar sleeve 1; The needle tip rod 2 is slidably connected to the inside of the needle bar sleeve 1 through a tapered block 21 sleeved on the outer surface of its circumference. The outer surface of the needle tip rod 2 is provided with a mounting assembly 22 that can be used to connect the needle bar sleeve 1. The tapered block 21 adopts a thin-upper-thick-lower design, and the diameter of its bottom end is the same as the diameter of the inner wall of the needle bar sleeve 1, which can ensure its stability when the two are fixedly installed and used, and avoid shaking during use; The mounting assembly 22 includes a connecting rod 221, which is rotatably connected to the outer circumferential surface of the needle tip rod 2 through an axle rod disposed inside the connecting rod 21, and the outer circumferential surface of the axle rod is sleeved with a torsion spring 222 connected to the inside of the connecting rod 221, and the inner circumferential surface of the needle rod sleeve 1 is fixedly connected with a ratchet block 223 for fixing the connecting rod 221; The bottom end of the needle bar sleeve 1 is provided with a guide member 11 for installing the needle tip rod 2 , and the interior of the needle bar sleeve 1 is provided with a disassembly member 12 for separating the needle tip rod 2 .

[0019] The guide member 11 includes a magnetic block 111, the upper surface of which is fixedly connected to the bottom end of the needle rod sleeve 1. The upper surface of the connecting rod 221 adopts a magnetic design that is magnetically connected to the magnetic block 111. Four connecting rods 221 are arranged and distributed in a circular array around the central axis of the needle tip rod 2.

[0020] A vertical groove 112 is provided inside the needle bar sleeve 1, and the bottom of the vertical groove 112 adopts a trumpet-mouth design. The vertical groove 112 and the magnetic block 111 are staggered with the central axis of the needle tip rod 2, and the angle between the magnetic block 111 and the vertical groove 112 is forty-five degrees. The circular outer surface of the needle tip rod 2 is fixedly connected with a limit block 113 that fits the inner wall of the vertical groove 112, and the top of the limit block 113 adopts a pointed design. An annular groove 114 is provided inside the needle bar sleeve 1, and the annular groove 114 is connected to the inside of the vertical groove 112.

[0021] The needle rod sleeve 1 is connected to a power contact piece 14 via a spring 13 arranged at the top end of the inner wall thereof, and the lower surface of the power contact piece 14 is in contact with the top end of the needle tip rod 2 .

[0022] The disassembly part 12 includes a baffle 121, and a shift groove 122 connected to the inside of the annular groove 114 is opened inside the needle bar sleeve 1. The outer surface of the baffle 121 slides in contact with the inner wall of the shift groove 122, and a tension spring 123 connected to the outer surface of the baffle 121 is arranged inside the shift groove 122. In the initial state, the baffle 121 is on one side of the inner wall of the shift groove 122.

[0023] The outer circumferential surface of the needle tip rod 2 is provided with a receiving cavity for accommodating the connecting rod 221 , so the interior of the needle tip rod 2 is provided with a limiting groove 23 connected to the interior of the receiving cavity, and the limiting groove 23 is slidably connected with a limiting plate 24 .

[0024] The circumferential inner surface of the needle bar sleeve 1 is fixedly connected with an arc block 15, and four arc blocks 15 are arranged around the central axis of the needle bar sleeve 1. A ratchet groove is provided on one side of the arc block 15 close to the central axis of the needle bar sleeve 1, which will produce a sound when the connecting rod 221 passes by. The bottom end of the needle tip rod 2 is fixedly connected with a contact head 25.

[0025] The process of installing the needle tip rod 2 inside the needle rod sleeve 1: In the initial state, multiple needle tip rods 2 are neatly accommodated inside the external box body, and the connecting rod 221 is in an unfolded state under the action of the internal torsion spring 222, and remains perpendicular to the needle tip rod 2. When the current probe is needed, the needle tip rod 2 of the required model and size is confirmed according to the label attached to the box body, and the needle rod sleeve 1 is held and its lower end is moved closer to the top of the required needle tip rod 2. Since the upper surface of the connecting rod 221 adopts a magnetic design, when the needle rod sleeve 1 is approached, the magnetic block 111 below it is magnetically connected with the connecting rod 221, and the needle tip rod 2 is instantly magnetically attracted to separate from the external box body. There are four connecting rods 221 and four magnetic blocks 111, and the width of the magnetic block 111 is slightly larger than that of the connecting rod 221. The two correspond one to one, and each group of connecting rods 221 is in the middle of the corresponding magnetic block 111.

[0026] At this time, the entire needle tip rod 2 is adsorbed below the needle bar sleeve 1 through the connecting rod 221. Due to the one-to-one magnetic attraction, the needle tip rod 2 is in the middle position below the needle bar sleeve 1, and the central axis of the needle tip rod 2 and the needle bar sleeve 1 are basically consistent. The connecting rod 221 and the limit block 113 are staggered on the outer surface of the circumference of the needle tip rod 2, and there is a forty-five degree angle between the connecting rod 221 and the limit block 113. The magnetic block 111 and the vertical groove 112 are staggered with the central axis of the needle bar sleeve 1 in the radial direction, and there is a forty-five degree angle between the magnetic block 111 and the vertical groove 112. Since the magnetic block 111 and the connecting rod 221 correspond one-to-one, in this state, the radial direction of the vertical groove 112 and the limit block 113 are consistent.

[0027] In this state, the user moves the needle tip rod 2 to the inside of the needle bar sleeve 1 without aligning the central axis again. The diameter of the inner wall of the circumference at the bottom of the needle bar sleeve 1 is larger than the diameter of the circumference at the top of the needle tip rod 2. The top of the needle tip rod 2 can be smoothly inserted into the inside of the needle bar sleeve 1. The limit block 113 on the outer surface of the circumference of the needle tip rod 2 corresponds to the vertical groove 112. The vertical groove 112 extends to the lower surface of the needle bar sleeve 1 and is designed in a trumpet shape. The vertical groove 112 at the bottom of the needle bar sleeve 1 is relatively wide, and the width becomes narrower after extending upward for a short distance. The limit block 113 also adopts a pointed design. The width of the limit block 113 is narrower on the side close to the connecting rod 221, and the width of the limit block 113 is wider on the side close to the conical block 21. The special shape design of the limit block 113 and the vertical groove 112 plays a guiding and limiting role, and can smoothly move the needle tip rod 2 to the inside of the needle bar sleeve 1. It ensures that the needle tip rod 2 is stably placed inside the needle rod sleeve 1 under the action of the limit block 113 and the vertical groove 112, and is in stable contact with the object to be measured during the subsequent measurement process. It can limit and ensure that the needle tip of the current probe accurately contacts the target position of the object to be measured during the measurement process, avoid inaccurate measurement points due to position deviation of the needle tip rod 2, thereby improving the accuracy and repeatability of the measurement.

[0028] When the stop block 113 moves with the needle tip rod 2, it enters the inner wall of the vertical groove 112, and its tip enters from the bell mouth at the bottom of the vertical groove 112 until it moves to the height at which the width of the vertical groove 112 is restored. The two sides of the stop block 113 slide in contact with the inner wall of the vertical groove 112, and the needle tip rod 2 as a whole cannot rotate in this state and can only move axially. When the needle tip rod 2 enters the inside of the needle bar sleeve 1, the connecting rod 221 moves with the needle tip rod 2, and is blocked by the magnetic block 111 during movement. Under the action of the torsion spring 222, the outer surface of the needle tip rod 2 rotates. The outer end of the connecting rod 221, which is away from the needle tip rod 2 in the initial state, now approaches the outer surface of the needle tip rod 2. The connecting rod 221 is in an inclined contracted state. In this state, the diameter of the circle surrounded by the outer ends of the four connecting rods 221 is equal to the diameter of the inner wall of the needle bar sleeve 1.

[0029] As the needle tip rod 2 continues to drive the limit block 113, the connecting rod 221 and other components to move into the needle bar sleeve 1, the side of the connecting rod 221 away from the needle tip rod 2 fits with the inner surface of the needle bar sleeve 1 until the connecting rod 221 moves to the position of the ratchet block 223, when the side of the connecting rod 221 fits with the inclined surface of the ratchet block 223. Since the needle bar sleeve 1 is stationary, the needle tip rod 2 moves, and the ratchet block 223 and the connecting rod 221 connected thereto are in a relative motion state. The connecting rod 221 is moved toward the central axis of the needle tip rod 2 by the ratchet block 223, and the connecting rod 221 rotates under the action of the torsion spring 222, and is almost horizontal with the needle tip rod 2. At this time, the top of the needle tip rod 2 fits with the lower surface of the power strip 14. As the needle tip rod 2 continues to move, the connecting rod 221 completely passes through the position of the ratchet block 223, and the connecting rod 221 loses the obstruction of the ratchet block 223, and its side away from the needle tip rod 2 continues to fit with the circumferential inner surface of the needle rod sleeve 1.

[0030] During this process, the conical block 21 sleeved on the outer surface of the circumference of the needle tip rod 2 also enters the interior of the needle bar sleeve 1 simultaneously. The conical block 21 is designed to be thin at the top and thick at the bottom. The diameter of the top of the conical block 21 is the same as the diameter of the needle tip rod 2, and the diameter of the bottom of the conical block 21 is the same as the diameter of the needle bar sleeve 1. When the conical block 21 enters the interior of the needle bar sleeve 1, the correction action is completed, so that the axes of the needle bar sleeve 1 and the needle tip rod 2 are completely consistent, avoiding shaking due to incomplete fit of the needle tip rod 2 in the needle bar sleeve 1 during subsequent measurements. Stable contact can avoid measurement fluctuations caused by vibration.

[0031] When the outer end of the connecting rod 221 passes through the ratchet block 223 and disengages from it, the user can hear a clicking sound, which means that the needle tip rod 2 has been successfully installed inside the needle bar sleeve 1, and there is no need to continue moving the needle tip position. At this time, the spring 13 is in a slightly compressed state, which can make the top of the needle tip rod 2 always fit tightly with the lower surface of the power connection sheet 14, avoiding the problem of being unable to measure due to the gap. In this state, the radial direction of the needle tip rod 2 is limited by the limit block 113 and the vertical groove 112, and it cannot rotate. In the axial direction of the needle tip rod 2, the upper part is abutted by the spring 13 and the power connection sheet 14, and the lower connecting rod 221 is affected by the torsion spring 222 and expands outward, and is limited by the ratchet block 223 and cannot move downward. At this point, the needle tip rod 2 and the needle bar sleeve 1 are installed and can be used normally.

[0032] The process of removing the needle tip rod 2 from the inside of the needle rod sleeve 1: When the contact head 25 is worn, or other types of contact heads 25 need to be used, the needle tip rod 2 needs to be replaced. In the initial state, the baffle 121 is at the right end of the displacement groove 122 under the action of the tension spring 123, and in this state, the baffle 121 is on the right side of the vertical groove 112. Push the needle tip rod 2 upward, at this time, the needle tip rod 2 drives the power supply sheet 14 to move upward, the spring 13 is in a tightly compressed state, and the limit block 113 on the outer surface of the needle tip rod 2 continues to slide against the inner wall of the vertical groove 112 until the limit block 113 slides to the top and enters the inner wall of the annular groove 114. The disassembly parts 12 are arranged in four circular arrays around the central axis of the needle rod sleeve 1. Taking one group of disassembly parts 12 as an example, when the limit block 113 moves to the top of the vertical groove 112, since the baffle 121 is on the right side of the vertical groove 112, the limit block 113 can smoothly enter the annular groove 114, and then the needle tip rod 2 is rotated counterclockwise as a whole. When the connecting rod 221 moves upward, one end of the connecting rod 221 away from the torsion spring 222 fits against the inner wall of the annular groove 114 .

[0033] At this time, the limit block 113 is affected by the annular groove 114, and the needle tip rod 2 cannot move radially. When the needle tip rod 2 rotates about forty-five degrees as a whole, the outer side of the connecting rod 221 fits with the arc surface of the outer side of the arc block 15. Under the action of the arc block 15, the connecting rod 221 rotates around the shaft rod, and the side of the connecting rod 221 completely fits with the inner wall of the storage cavity on the outer surface of the needle tip rod 2 and is in a vertical state. The surface of the arc block 15 close to the central axis of the needle rod sleeve 1 is also provided with a ratchet groove, and the connecting rod 221 will make a clicking sound when passing by. At this time, the entire needle tip rod 2 and the needle rod sleeve 1 are inverted and turned one hundred and eighty degrees. At this time, the contact head 25 is at the top.

[0034] Affected by gravity, the outer end of the limit plate 24 in the limit groove 23 extends into the accommodating cavity, and the side of the limit plate 24 close to the central axis of the needle tip rod 2 fits with the outer surface of the connecting rod 221, keeping the connecting rod 221 in a retracted state. At this time, the needle tip rod 2 as a whole continues to be rotated according to the original state. When the needle tip rod 2 as a whole is close to rotating ninety degrees, the side of the limit block 113 facing forward in the rotation direction will fit with the baffle 121 in the next disassembly part 12. When the baffle 121 approaches the side of the rotation direction of the vertical slot 112 corresponding to the disassembly part 12, the baffle 121 moves in the displacement slot 122, and its maximum stroke is that the outer surface of the baffle 121 is coplanar with the inner wall of the vertical slot 112. During this process, the tension spring 123 is elastically deformed and stretched (the limit block 113 adopts a pointed design. When the tension spring 123 is used many times, its toughness becomes low and fatigue occurs, and it will not return to its initial position again. The pointed front end of the limit block 113 first enters the annular groove 114 from the vertical slot 112, squeezing the right side of the baffle 121 corresponding to this position, and the limit block 113 can smoothly enter the annular groove 114 to complete the quick disassembly work).

[0035] Since the vertical groove 112 is connected to the inside of the annular groove 114, the limit block 113 is blocked by the baffle 121 after rotation and cannot move further. By pulling the needle tip rod 2 upward, the limit block 113 enters the inner wall of the vertical groove 112 and fits with it. The baffle 121 inside the annular groove 114 is no longer affected by the limit block 113 and quickly returns to its original state under the action of the tension spring 123. In this state, the needle tip rod 2 rotates ninety degrees as a whole, corresponding to the initial position. At this time, the connecting rod 221 on the outer surface of the needle tip rod 2 is still in contact with the outer surface of the limit plate 24, inside the accommodating cavity. During the lifting process of the needle tip rod 2, the connecting rod 221 is not affected by the ratchet block 223 and is in a contracted state. The needle tip of the spring 13 is smoothly taken out from the inside of the needle bar sleeve 1. The spring 13 is set inside the needle bar sleeve 1 to avoid the loss of small parts during disassembly. The above installation process can be repeated to take out a suitable needle tip rod 2 from the box body for reinstallation or storage.

[0036] In summary, the needle bar sleeve 1 and the needle tip bar 2 have the following advantages: Advantage 1: The needle rod sleeve 1 and the needle tip rod 2 adopt a detachable design. When the contact head 25 is partially worn or another type of contact head 25 needs to be used, it is only necessary to separate the needle tip rod 2 from the needle rod sleeve 1 as a whole and replace it. This design allows only the needle tip rod 2 to be replaced instead of the entire probe, which can save costs.

[0037] Advantage 2: Through the cooperation between the guide member 11 and the installation assembly 22, the installation process of the needle tip rod 2 can be quickly completed, and the user can quickly replace the needle tip rod 2 with different characteristics (such as different needle tip shapes, materials, lengths, etc.) to adapt to various complex test scenarios.

[0038] Advantage three: through the cooperation between the arc block 15, the disassembly part 12, the installation assembly 22 and the limit plate 24, the disassembly process of the needle tip rod 2 can be quickly completed. The current probe that can quickly disassemble the needle tip rod 2 is more convenient to carry and store. When the probe needs to be moved or transported, the needle tip rod 2 can be disassembled and stored separately, which avoids the needle tip rod 2 from being damaged by collision during transportation. At the same time, it also reduces the volume of the entire probe, which is convenient for storage and organization.

[0039] Advantage 4: The entire installation and removal process does not require the use of additional tools. It only needs to be pressed and rotated by hand, and can be completed under the action of magnetism and gravity. The installation and removal method without additional tools greatly improves the operating efficiency. The operator can quickly replace the needle tip rod 2 with bare hands, avoiding the tedious process of finding suitable tools, installing and removing tools in the tool kit, making the test process smoother, and being able to complete multiple needle tip rod 2 replacement operations in a short time, significantly shortening the test preparation time and the overall test cycle, and improving work efficiency.

[0040] Advantage 5. The bottom end of the needle bar sleeve 1 is fixedly connected to a magnetic block 111, and the upper surface of the connecting rod 221 adopts a magnetic design that is magnetically connected to the magnetic block 111. There are four magnetic blocks 111 and four connecting rods 221, and the magnetic blocks 111 and the connecting rods 221 correspond one to one. The preliminary alignment of the center axis can be completed while the two end surfaces of the needle bar sleeve 1 and the needle tip rod 2 are attracted. Through the magnetic connection between the magnetic block 111 and the connecting rod 221, the two can be aligned with each other before installation, which greatly reduces the installation time and operation difficulty, and avoids the traditional installation method that requires careful adjustment of the position, and ensures the alignment of the center axis through visual observation or complex mechanical auxiliary devices. This process is often cumbersome and time-consuming.

[0041] Advantage 6. During use, in the axial direction, the two sides of the limit block 113 outside the circumference of the needle tip rod 2 fit with the inner wall of the vertical groove 112 and cannot rotate horizontally; in the radial direction, the connecting rod 221 is in an expanded state under the action of the torsion spring 222, and is blocked by the ratchet block 223 below, while the upper part is squeezed by the spring 13 through the power connection plate 14. During normal use, even if the needle tip rod 2 is pressed to the deepest as a whole, it will not be disassembled, which can ensure that the measurement process will not be interrupted due to accidental disconnection. The stable connection can continuously obtain current data, ensure the integrity and continuity of the data, and improve the safety performance during use.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A current probe with a replaceable needle tip and a quick locking structure, characterized in that: include: Needle bar sleeve (1); A needle tip rod (2), the needle tip rod (2) being slidably connected to the inside of the needle bar sleeve (1) via a conical block (21) sleeved on the outer circumferential surface of the needle tip rod (2), and a mounting assembly (22) that can be used to connect to the needle bar sleeve (1) is provided on the outer surface of the needle tip rod (2); The mounting assembly (22) comprises a connecting rod (221), the connecting rod (221) being rotatably connected to the circumferential outer surface of the needle tip rod (2) via a shaft arranged inside the connecting rod, and the circumferential outer surface of the shaft is sleeved with a torsion spring (222) connected to the inside of the connecting rod (221), and the circumferential inner surface of the needle rod sleeve (1) is fixedly connected to a ratchet block (223); The bottom end of the needle bar sleeve (1) is provided with a guide member (11) for mounting the needle tip rod (2), and the interior of the needle bar sleeve (1) is provided with a disassembly member (12) for separating the needle tip rod (2).

2. A current probe with a replaceable needle tip and a quick locking structure according to claim 1, characterized in that: The guide member (11) comprises a magnetic block (111), the upper surface of the magnetic block (111) being fixedly connected to the bottom end of the needle rod sleeve (1), the upper surface of the connecting rod (221) being magnetically connected to the lower surface of the magnetic block (111), and four connecting rods (221) being arranged and distributed in a circular array around the central axis of the needle tip rod (2).

3. The current probe with a replaceable needle tip and a quick locking structure according to claim 2, characterized in that: A vertical groove (112) is provided inside the needle bar sleeve (1), and the bottom of the vertical groove (112) is of a bell-mouth design. The vertical groove (112) and the magnetic block (111) are staggeredly distributed around the central axis of the needle tip rod (2), and the angle between the magnetic block (111) and the vertical groove (112) is forty-five degrees. A limit block (113) that fits the inner wall of the vertical groove (112) is fixedly connected to the circumferential outer surface of the needle tip rod (2). An annular groove (114) is provided inside the needle bar sleeve (1), and the annular groove (114) is connected to the inside of the vertical groove (112).

4. The current probe with a replaceable needle tip and a quick locking structure according to claim 3, characterized in that: The needle rod sleeve (1) is connected to a power connection plate (14) via a spring (13) arranged at the top end of its inner wall, and the lower surface of the power connection plate (14) fits with the top end of the needle tip rod (2).

5. The current probe with a replaceable needle tip and a quick locking structure according to claim 2, characterized in that: The disassembly member (12) comprises a baffle (121), a shift groove (122) connected to the inside of the annular groove (114) is provided inside the needle bar sleeve (1), the outer surface of the baffle (121) slides in contact with the inner wall of the shift groove (122), and a tension spring (123) connected to the outer surface of the baffle (121) is provided inside the shift groove (122).

6. The current probe with a replaceable needle tip and a quick locking structure according to claim 1, characterized in that: The outer circumferential surface of the needle tip rod (2) is provided with a receiving cavity for accommodating a connecting rod (221), the interior of the needle tip rod (2) is provided with a limiting groove (23) which is in communication with the interior of the receiving cavity, and the limiting groove (23) is slidably connected to a limiting plate (24).

7. The current probe with a replaceable needle tip and a quick locking structure according to claim 1, characterized in that: The circumferential inner surface of the needle bar sleeve (1) is fixedly connected to an arc surface block (15), and four arc surface blocks (15) are arranged around the central axis of the needle bar sleeve (1). The bottom end of the needle tip rod (2) is fixedly connected to a contact head (25).

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